Want to dynamically generate a list through reflection, the results failed, seek expert

class

String s1 = "java.util.ArrayList ";
Class itemClass = Class.forName (s1);
Object o = itemClass.newInstance ();

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String s1 = "java.util.ArrayList";
Reply:

cited a floor youngc527 reply:

String s1 = "java.util.ArrayList";

This method is feasible, ok
String s1 = "java.util.ArrayList";
Class itemClass = Class.forName (s1);
ArrayList list = itemClass.newInstance ();
Object item = Class.forName ("java.lang.Double");
list.add (item);